VARIANT 1:
$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer
$ sudo apt-get install oracle-java8-set-default
http://tecadmin.net/install-oracle-java-8-jdk-8-ubuntu-via-ppa/
VARIANT 2:
Remove OpenJDK (If OpenJDK installed)
$ sudo apt-get purge -y openjdk*
Then add on .bashrc link on file .bash_profile. (as redhat distributives):
$ vi ~/.bashrc ############################################################ # To use bash_profile as file with Locat Variables . ~/.bash_profile ############################################################